QUESTIONSHEET 1

(a) skis spread force over larger area than boots                                                                                              1

(b) (i)    pressure = force / area                                                                                                                      1                           1

500 N / 0.2 m2  ´  2                                                                                                                          1                           1

= 1250 Pa/Pascal/Nm-2                                                                                                                                                            1                         1

(ii)    500N / 0.05 m2  ´  2                                                                                                                          1                           1

= 5000 Pa/Pascal/Nm-2                                                                                                                                                            1                         1

(iii)   area  =  force / pressure                                                                                                                    1                         1

600 N / 1250 Pa                                                                                                                                1                           1

=  0.48 m2   /2                                                                                                                                   1                             1

=  0.24 m2                                                                                                                                                                                      1                             1

TOTAL  / 10

QUESTIONSHEET 2

(a) Any three from:

road surface condition

tyre condition

brake condition

reaction time

speed of bicycle                                                                                                                                       3                           3

(b) (i)    bigger, so greater mass                                                                                                                      1                         1

(ii)    deceleration  =  change in speed / time                                                                                               1

-10 ms-1  / 2.5 s                                                                                                                                 1                           1

=  - 4 ms-2 (accept 4 ms‑2)                                                                                                                                                       1                             1

TOTAL  / 7

QUESTIONSHEET 3

(a) None/no forces acting                                                                                                                               1                           1

(b) gets faster/speeds up/velocity increases                                                                                                     1

force backwards produces equal and opposite force forwards/

force one way produces equal force in opposite direction                                                                            1

1

(c) acceleration = force / mass                                                                                                                       1                         1

20 000 / 1000                                                                                                                                                                                         1                           1

= 20 ms-2 / 0.02 kms-2                                                                                                                                                                         1                           1

(d) acceleration = change in velocity / time                                                                                                      1

20 ms-2 ´  10 s                                                                                                                                         1                             1

change in velocity = 200 ms-1                                                                                                                                                           1                         1

final velocity = 2200 ms-1                                                                                                                                                                   1                         1

TOTAL  / 10

QUESTIONSHEET 4

(a) 250 Pa  ´­­  55 m3 / 50 m3                                                                                                                                                                    1                         1

=  275 Pa/Nm-2                                                                                                                                                                                      1                           1

(b) (i)    15

10

8                                                                                                                                                          3                                  3

(ii)    the volume decreases/reduces/goes down

(NOT is less, is smaller)                                                                                                                    1                         1

(c) One from:

bicycle tyres/car tyres/life jackets/dinghies/air bags in cars                                                                          1

TOTAL  / 7

QUESTIONSHEET 5

(a) arrow directly downwards labelled gravity                                                                                                  1

arrow directly upwards labelled air resistance                                                                                             1

(b) (i)    Sweet                                                                                                                                              1                                  1

air resistance greater for paper than sweet                                                                                         1

(ii)    force = mass ´ acceleration                                                                                                               1                         1

0.01 kg  ´  10 ms-2 / 1000                                                                                                                  1                         1

= 0.1 N                                                                                                                                                 1                             1

(c) (i)    both fall to ground                                                                                                                             1                           1

hit ground at same time                                                                                                                     1                         1

(ii)    no atmosphere to exert force/no air resistance/

no air to exert force                                                                                                                          1                           1

TOTAL  / 10

QUESTIONSHEET 6

(a) (i)    It goes up/rises                                                                                                                                 1                           1

(ii)    force is transmitted by/passed through liquid                                                                                       1

(b) (i)    pressure = force / area                                                                                                                      1                           1

2000 N / 0.001 m2

or  2 kN / 0.001m2                                                                                                                                                                      1                           1

= 2000 kPa/2 000 000 Pa (or Nm-2 )                                                                                                   1                    1

TOTAL  / 5

QUESTIONSHEET 7

(a) equal and opposite/balanced                                                                                                                      1                         1

(b) 50 N                                                                                                                                                            1                                  1

towards team X                                                                                                                                        1                         1

(c) 750 N                                                                                                                                                      1                             1

towards team Y                                                                                                                                       1                         1

(d) acceleration = force / mass                                                                                                                       1                         1

800 N / 200 kg                                                                                                                                         1                           1

= 4 ms-2  towards team X                                                                                                                          1

TOTAL  / 9

QUESTIONSHEET 8

(a) weight is the force that gravity exerts on an object                                                                                      1

mass measures the amount of matter in a body                                                                                           1

(b) (i)    Newton                                                                                                                                            1                             1

(ii)    55 ´ 10                                                                                                                                             1                             1

=  550 N                                                                                                                                           1                             1

(iii)   W = m ´ g

so m = W / g                                                                                                                                    1                             1

0.001 / 10                                                                                                                                         1                             1

=  0.0001 g                                                                                                                                       1                             1

TOTAL  / 8

QUESTIONSHEET 9

(a) Alice                                                                                                                                                       1                             1

(b) (i)    average speed/(speed)  =  distance / time                                                                                           1

200 m / 30 s                                                                                                                                      1                             1

=  6.67 m-2                                                                                                                                                                                     1                             1

(ii)    time  = distance / speed/average speed                                                                                               1               1

300 m / 6.67 m-2                                                                                                                                                                          1                           1

=  44.9 / 45 s                                                                                                                                    1                             1

(c) Direction of motion                                                                                                                                   1                           1

TOTAL  / 8

QUESTIONSHEET 10

(a) (i)

all points correctly plotted                                                                                                           2                         2

points joined with line                                                                                                                  1                           1

(ii)      8 ms-1                                                                                                                                                                                     1                                  1

(b) acceleration = change in speed / time                                                                                                         1                    1

5 ms-1 / 50 s                                                                                                                                             1                             1

=  0.1 ms-2                                                                                                                                                                                               1                             1

(c) the forces are balanced/no resultant force/

equal and opposite                                                                                                                                    1                           1

TOTAL  / 8

QUESTIONSHEET 11

(a) 23.5 N                                                                                                                                                     1                                  1

(b) (i)

points plotted correctly                                                                                                                      1                         2

best fit line                                                                                                                                        1                             1

(ii)    1.6 kg                                                                                                                                               1                         1

(iii)   elastic limit has been reached/exceeded/

spring stretched beyond elastic limit                                                                                                    1                    1

spring will not return to original length                                                                                                 1

(iv)   between 18 N and 19.5 N                                                                                                                  1                         1

TOTAL  / 8

QUESTIONSHEET 12

 effort

(a) (i)

 pivot

 effort

 pivot

 load

 load

½ mark for each correct label, round to integer                                                                            3

(ii)    wheelbarrow – load and effort on same side of pivot                                                                           1

scissors – load & effort on opposite sides of pivot                                                                               1

(b) less effort applied to do same work                                                                                                            1                         1

more movement of screwdriver                                                                                                                 1                         1

(c) 10 ´25 = 250                                                                                                                                            1                                  1

250 / 100                                                                                                                                                  1                                  1

=  2.5 N                                                                                                                                                   1                                  1

TOTAL  / 10

QUESTIONSHEET 13

(a) B, C, A                                                                                                                                                    1                                  1

less likely to topple if greater mass at base                                                                                                 1                    1

(b) (i)    contains weight in base                                                                                                                      1                           1

(ii)    point through which weight acts                                                                                                         1                         1

producing a balance point                                                                                                                  1                           1

(c) suspend plywood                                                                                                                                      1                             1

hang a weight from suspension point                                                                                                          1                         1

marks position of string                                                                                                                             1                           1

repeat with new position                                                                                                                           1                           1

where lines cross is balance point                                                                                                              1                         1

TOTAL  / 10

QUESTIONSHEET 14

(a) (i)    spread mass over larger area                                                                                                             1                           1

less pressure on roof                                                                                                                         1                             1

(ii)    spread mass over larger area                                                                                                             1                           1

less likely to sink in soft snow                                                                                                            1                         1

(iii)   sharp knife has smaller surface area on cutting edge                                                                           1

more pressure applied                                                                                                                       1                             1

(b) 600 / 2 = 300 N each foot.                                                                                                                        1

= 300 / (0.01)2                                                                                                                                                               1

=  3  000 000 N / m2                                                                                                                                                                            1

= 3000 kN/m2                                                                                                                                           1

TOTAL  / 9

QUESTIONSHEET 15

(a) LHS – 400 ´ 2  =  800                                                                                                                              1                             1

RHS – 300 ´ 2  =  600                                                                                                                              1                           1

difference = 200                                                                                                                                       1                             1

position = 250 / 200                                                                                                                                   1                             1

Ž  1.25 m from pivot on Dick’s side                                                                                                         1                         1

(b) (i)

 80

 70

 20

 10

 0

 40

 30

 20

 10

 Extension / m

sensible scales                                                                                                                           1                                  1

labelled axes                                                                                                                              1                                  1

correct plotting                                                                                                                           2                             2

(ii)    20 m                                                                                                                                                1                                       1

(iii)   27 tonnes                                                                                                                                          1                                  1

TOTAL  / 11

QUESTIONSHEET 16

(a) (i)    -10 N                                                                                                                                               1                                       1

(ii)    0 N                                                                                                                                                  1                                       1

(iii)   + 100 N                                                                                                                                            1                                  1

(b) (i)    500 000  +  250 000                                                                                                                           1                             1

=  750 000 N                                                                                                                                    1                                  1

(ii)    the exact angles                                                                                                                                1                             1

(iii)   use the angles & forces to a scale                                                                                                      1                         1

to draw triangle                                                                                                                                 1                             1

measure side in direction of boat                                                                                                        1                         1

TOTAL  / 9

QUESTIONSHEET 17

(a) Stretches evenly                                                                                                                                       1                             1

returns to original length                                                                                                                            1                           1

(b) (i)    12 cm                                                                                                                                               1                                       1

(ii)    8.5 cm                                                                                                                                              1                                       1

(c) yes                                                                                                                                                          1                                       1

it is no longer stretching uniformly/evenly                                                                                                   1                    1

(d) 50 N balance                                                                                                                                            1

TOTAL  / 7

QUESTIONSHEET 18

(a) (i)    useful                                                                                                                                               1                                       1

(ii)    nuisance                                                                                                                                           1                                  1

(iii)   nuisance                                                                                                                                           1                                  1

(iv)   useful                                                                                                                                               1                                       1

(v)   useful                                                                                                                                               1                                       1

(b) floats on air cushion                                                                                                                                  1                             1

no contact with sea                                                                                                                                   1                           1

TOTAL  / 7

QUESTIONSHEET 19

(a) (i)    draw has mass                                                                                                                                  1                                  1

work done to move it                                                                                                                         1                             1

(ii)    you have mass                                                                                                                                  1                                  1

work done to lift you                                                                                                                         1                             1

(b) climb flight of stairs                                                                                                                                  1                             1

larger mass moved                                                                                                                                   1                             1

through greater distance                                                                                                                            1                           1

TOTAL  / 7

QUESTIONSHEET 20

One mark for each word/phrase

push

pull

friction

slowly

magnetic

tension

electrical / electrostatic

gravity

float

rise                                                                                                                                                                               10

TOTAL  / 10